What symbol in transformer ratings denotes separate windings?

The hyphen is used in transformer ratings to denote separate windings. This indicates that there are distinct sets of windings in the transformer, essential for various configurations and applications. For example, when specifying transformer ratings, a designation such as "240-120" indicates two separate windings: one for 240 volts and the other for 120 volts. This notation helps in identifying transformers that can handle multiple voltages or setups safely and efficiently without confusion over their internal wiring.

Understanding this symbol is crucial for linemen and electricians when working with transformers in the field, as it ensures they are aware of how the transformer operates, allowing for appropriate handling, installation, and troubleshooting practices.